Hydrochloric Acid → [2-(4-Chloro-phenyl)-5,6-difluoro-benzoimidazol-1-yl]-cyclohexyl-acetic acid methyl ester

Participants

Reaction Steps

To the solution of 1 g (2.47 mmol) [2-(4-chloro-phenyl)-5,6-difluoro-benzoimidazol-1-yl]-cyclohexyl-acetic acid in 10 ml N,N-dimethylformamide, 129 mg (2.964 mmol) sodium hydride (55% dispersion in mineral oil) and 368 mg (2.594 mmol) methyl iodide were added. The reaction was stirred at room temperature for 2 h and then poured on 100 ml ethyl acetate and 100 ml 1M aqueous hydrochloric acid. The phases were separated and the organic layer washed two times with 100 ml water and 100 ml brine. The combined water layers were extracted with 100 ml ethyl acetate, dried over magnesium sulfate, filtered and evaporated. The residue was purified by silica gel chromatography using a MPLC system (CombiFlash Companion, Isco Inc.) eluting with a gradient of n-heptane:ethyl acetate (100:0 to 60:40). Colorless solid (92%). MS (Turbo Spray): m/z=419.1 [M+H].

Provenance & Evidence